www.boxertrix.com

Spotted on another site;

Offered for sale is a pair of excellent aftermarket A C Schnitzer wheels for the R1100S / BoxerCup reps. Wheels need a gentle polish to restore to their shiny magnificence! Will post worldwide. Please email for more details, photos, price etc to HarrisBikeNut@aol.com

There was a pair unused at Cooper Motorrad Sunderland years ago. I tried to buy them but they wouldn't sell. Bit heavier than the standard wheels I think